Starter switch for split phase



June 13, 1950 v, PORTELLA 2,511,799

STARTER SWITCH FOR SPLIT PHASE MOTORS Filed Dec. 18, 1947 HGZ. [76.3

F v 2 E Z 6 i 0 L H a Patented June 13, 1950 STARTER SWITCH FOR SPLIT PHASE MOTORS Ceiedonio Vila Portella, Barcelona, Spain Application December 18, 1947, Serial No. 792,542 In Spain April 26, 1947 2 Claims.

This invention relates to starter switches for a split phase motor.

It is an object of the present invention to provide a starter switch for a split phase motor with an armature which moves while maintaining the same angular relationship to the axis of the core.

The invention comprises in combination a U-shaped magnetic core adapted to be energized by the frontal part of the main winding of the motor, two bolts arranged in parallel to the axis of the U-shaped core, an armature provided with holes for the bolts so that it is, in all positions, held substantially at right angles to the axis of the core. a spring adapted to separate the armature from the core, a switch connected in series to the starting winding of the motor and including a strip and a contact piece carried by the strip, and a member carried by the armature and adapted to shift the strip into contact opening position when the core is deenergized.

The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

Fig. l is an elevational view of a starter switch according to the invention;

Fig. 2 is a sectional view of Fig. 1;

Fig. 3 is a side view partly in section of the switch shown in Figs. 1 and 2; and

Fig. 4 is a diagram of the electric circuit of the switch.

Referring now to the drawings, and first to Figs. 1 to 3, A is a frame of insulating material, such as Bakelite, fibre, ebonite, porcelain, presspahn or any other insulating material capable of supporting the assemblage of said electromagnet.

B is a horse-shoe core comprising iron sheets which, together with the electro-magnet constialong the line 2-4 C is the soft magnet provided with holes at both ends for the accommodation of the rods, which serve to hold and guide same during displacements parallel to the axis of the electro-magnet.

D is a helical steel spring arranged between the insulation A and the armature C for compensating movements during the starting and working periods.

E is a metal contact strip, highly conductive and resilient, which forms part of the motor startiiig switch.

F are the two cylindrical non-magnetic metal rods, serving as guides and supports for the armature C. the ends of which they traverse so as to allow the opening and closing displacements.

G is a highly conductive metal rod or pin for the support and connexion of the contact strip E of the auxiliary motor starting phase.

G is a conductive pin corresponding to the rod G with which it forms the circuit.

H is an insulating separator located between the armature C and the contact strip E.

I are connecting screws provided in the pins G and G.

J is the head of pin G.

M is the motor winding core B.

In referring to the diagram according to Fig. 4, the numeral 1 designates the automatic electromagnetic starter device; 2 the main or working winding, and 3 the auxiliary winding.

When the motor is switched off, the armature C remains separated from the core B under the action of the helical spring D. Thus the contact strip E is opened by the pressure which the spring D applies to said armature C, which is in connexion with said contact strip E.

Upon closing the circuit for the startin of the motor, a high current intensity produces a stray flux, which instantaneously attracts armature C-thereby closing the circuit of the auxiliary winding, which together with the main windin produces a rotating field for the starting of the motor.

As soon as the required speed is reached, the intensity of current drops to normal at which the armature C becomes detached, thereby applying pressure to the contact strip E and thus cutting off the auxiliary or starting winding, whilst the motor continues to run normally with the main or working winding. During the running of the motor, no other member of the described switch except the helical spring D is in action.

Should the speed, for any reason whatsoever, drop below normal, with a consequential increase of the intensity of current, then the electromagnet again takes up its function together with the closing of the auxiliary circuit until the normal motor speed is reached, provided the rating voltage of the system is correct and no surrounded by the accidental cause afiects the motor by an excessive load superior to the normal.

What I claim is:

1. A starter switch for a split phase motor comprisin in combination a U-shaped magnetic core adapted to be energized by the frontal part of the mainwinding of the motor; ttwo bolts arranged in parallel to the axis rat-said Ushaped core; an armature provided with holes for said bolts so that it is, in all positions, held substan tialiy at right angles to the axis of said core; a spring adapted to separate said-armatuie from said core; a switch connected in series to the starting winding of the motor and including a strip and a contact piece carried by said strip; and a member carried by said aa'matm'e and adapted to shift said strip into contactupening position when said core is de-energized.

2. A starter switch for a split phase motor comprising in combination an insulating plate; a U-shaped magnetic core arranged substantially at right angles to said plate and adapted to be energized by the frontal part of the main winding of the motor; two bolts arranged substantially at right angles to said plate and in parallel to the axis of said U-shaped core; an armature provided with holes for said bolts so that it is, in all positions, held substantially at right angles to the axis of said core; a spring arranged between said plate and said armature and adapted sotseparate said armature from said core; aswitch cormected in serles to the starting winding of the motor and including a strip and acontact piece carried by said strip; and a member carried by said armature and adapted to shift said strip into contact opening position when said core is ole-energized.

CELEDONIO VH-IA PORTELLA.

-BEFEENCES CITED The following references are of record in the fiienf fl'iis patent:

UNITED STATES PATENTS 

